a) Spermatid: the haploid cell, resulting from meiosis of a primary spermatocyte that will mature into a sperm.
b) Spermatocyte: a male gametocyte, from which a spermatozoon develops
c) Spermatogenesis: Process of formation of sperms
d) Oocyte: a cell in an ovary which may undergo meiotic division to form an ovum.
e) oogenesis: Process of formation of egg.
f) Spore: An asexual reproductive protoplast capable of developing into a new individual.
g) Gametophyte: The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes.
h) Sporophyte: The multicellular diploid plant structure is called the sporophyte, which produces spores through meiotic (asexual) division.
i) Sporogenesis: Process of formation of spores/
j) Microsporogenesis: The formation of microspores inside the microsporangia (or pollen sacs) of seed plants. A diploid cell in the microsporangium, called a microsporocyte or a pollen mother cell, undergoes meiosis and gives rise to four haploid microspores.
k) Megasporogenesis: Megasporogenesis refers to the development of megaspores from the megasporocyte, the cell that undergoes meiosis.
l) Gametogenesis: The process by which gametes, or germ cells, are produced in an organism.